Part Number 491 08 1 4 18NPT having (CAGE Code 31949) and FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings in stock with ready to ship. Get an instant quote for 491 08 1 4 18NPT Nipple Threaded by Brooks Automation Inc Cti Cryo. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.